NED Abstract

Copyright by Royal Astronomical Society.
2016MNRAS.458..264H
Redshifts distribution in A262
Hassan, M. S. R.; Abidin, Z. Z.; Ibrahim, U. F. S. U.; Hashim, N.; Lee, D.
A. A.
Abstract. Galaxy clusters are the largest virialized systems in the
Universe containing a collection of galaxies of different redshifts. The
redshift distribution of galaxies in galaxy clusters is concentrated at a
certain redshift range which remarkably tells us that only the galaxies in
a certain radial range belong to the galaxy cluster. This leads to a
boundary estimation of the cluster. Background and foreground systems are
represented by a histogram that determines whether some of the galaxies
are too far or too high in redshift to be counted as the member of the
cluster. With the recent advances in multifibre spectroscopy, it has
become possible to perform detailed analysis of the redshift distribution
of several galaxy clusters in the Abell Catalogue. This has given rise to
significantly improved estimates of cluster membership, extent and
dynamical history. Here we present a spectroscopic analysis of the galaxy
cluster A262. We find 55 galaxies fall within z = 0.0143 and 0.0183 with
velocity range 4450-5300 km s^-1^, and are therefore members of the
cluster. We derived a new mean redshift of z = 0.016 173 +/- 0.000 074
(4852 +/- 22 km s^-1^) for the system of which we compare with our neutral
hydrogen (H I) detection which peaks at 4970 +/- 0.5 km s^-1^. It is found
that the distribution of H I tends to be located at the edge of the
cluster since most of spiral rich galaxies were away from cluster centre.
Key words: techniques: spectroscopic, galaxies: clusters: general, radio
lines: general